Merge tag 'tty-7.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are some small tty/serial driver fixes for 7.3-rc6. Nothing major
  here, just lots of small fixes for reported issues, some of them very
  long-standing:

   - tty hangup fixes that have been there since the BKL days and kept
     tripping people up over time.

   - vt selection bugfix

   - other vt bugfixes (memory leaks and screen update fixes)

   - n_gsm bugfix

   - qcom-geni serial driver bugfix

   - 8250 serial driver bugfixes

   - other tiny serial driver fixes

  All of these have been in linux-next, the last few only a few days but
  testing here seems solid (this pull request was generated on that
  tree)"

* tag 'tty-7.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (37 commits)
  tty: add missing driver flag kernel-doc colon
  vt: selection: Fix unsigned underflow and slab-out-of-bounds read in paste_selection()
  vt: skip screen update for DEC alignment test on backgroup consoles
  vc_screen: reload vc pointer before if (ret) in vcs_write() to avoid UAF
  serial: sc16is7xx: reduce TX refill rate with half-FIFO trigger
  serial: sc16is7xx: refill TX FIFO below trigger using fresh TXLVL
  serial: tegra: don't clear the Tx FIFO on an Rx-only reset
  serial: sc16is7xx: fix TX gap caused by kfifo circular buffer wrap-around
  tty: fix saved termios reset race
  tty: serial: mpc52xx_uart: move static declarations up.
  tty: serial: max3100: shut down timer before freeing port
  tty: add break_wait kernel-doc
  serial: qcom-geni: keep registered console runtime active
  serial: qcom-geni: Fix unbalanced runtime PM resume for no_console_suspend
  serial: qcom-geni: avoid unused-function warning
  tty: serial: qcom_geni_serial: Keep console RX functional after deep idle
  soc: qcom: geni-se: Correct QUP Core ICC vote constants
  serial: 8250_bcm7271: fix use-after-free in brcmuart_remove()
  serial: vt8500: Fix clock reference leak in vt8500_serial_probe()
  kgdboc: Fix tty driver reference leak in configure_kgdboc()
  ...

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/tty/vt/selection.c b/drivers/tty/vt/selection.c
index 13f4e48b4..f1a3bc5b5 100644
--- a/drivers/tty/vt/selection.c
+++ b/drivers/tty/vt/selection.c
@@ -434,8 +434,8 @@ int paste_selection(struct tty_struct *tty)
 			bps = NULL;
 		}
 
-		count = vc_sel.buf_len - pasted;
-		if (count) {
+		if (vc_sel.buf_len > pasted) {
+			count = vc_sel.buf_len - pasted;
 			pasted += tty_ldisc_receive_buf(ld, vc_sel.buffer + pasted,
 							NULL, count);
 			if (vc_sel.buf_len > pasted)